A fly on a leaf
_There once was an old fly who swallowed a lady
It sounds kinda shady that she swallowed a lady
Perhaps she'll die, that poor little fly..._
When shooting models with short attention spans and/or busy schedules, it's very important to seize control of the situation and do everything in your power to hold their attention. I like to make up amusing (and occasionally dark) anecdotes the subject can relate to.